Any of various membranes or sheets of muscle or ligament which separate one cavity from another.
In a speaker, the thin, semi-rigid membrane which vibrates to produce sound.
A thin opaque structure with a central aperture, used to limit the passage of light into a camera or similar device.
A floor slab, metal wall panel, roof panel or the like, having a sufficiently large in-plane shear stiffness and sufficient strength to transmit horizontal forces to resisting systems.
A contraceptive device consisting of a flexible cup, used to cover the cervix during intercourse.
A flexible membrane separating two chambers and fixed around its periphery that distends into one or other chamber as the difference in the pressure in the chambers varies.
In mammals, a sheet of muscle separating the thorax from the abdomen, contracted and relaxed in respiration to draw air into and expel air from the lungs; also called thoracic diaphragm.
A permeable or semipermeable membrane.
To reduce lens aperture using an optical diaphragm.
To act as a diaphragm, for example by vibrating.
An outer protective covering such as the feathers or skin of an animal, a rind or shell.
The outer layer of an ovule, which develops into the seed coat.
A shell or other outer protective layer.